replace gpu id

tests/ocr_rec_params.txt

 ===========================train_params===========================
 model_name:ocr_rec
 python:python3.7
-gpu_list:0|2,3
+gpu_list:0|0,1
 Global.use_gpu:True|True
 Global.auto_cast:null
 Global.epoch_num:lite_train_infer=2|whole_train_infer=300
@@ -41,7 +41,7 @@ inference:tools/infer/predict_rec.py
 --use_gpu:True|False
 --enable_mkldnn:True|False
 --cpu_threads:1|6
---rec_batch_num:1
+--rec_batch_num:1|6
 --use_tensorrt:True|False
 --precision:fp32|fp16|int8
 --rec_model_dir: